Integrated DC/DC Converter for Bidirectional Wireless Charging
Solution Overview
Problem
Current wireless charging systems face inefficiencies in converting and transmitting power wirelessly due to limitations in voltage regulation and impedance matching between source and target devices, leading to suboptimal power transfer efficiency.
Innovation Solution
The proposed solution involves an apparatus with an AC/DC converter, an integrated DC/DC converter, and a power amplifier that converts AC power received wirelessly into DC power, steps down or steps up voltage levels as needed, and amplifies the power based on resonant frequency, utilizing capacitors, transistors, and inductors to manage voltage and impedance, with a controller to switch between receiving and transmitting modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If voltage regulation and impedance matching are not optimized, then power transfer efficiency is low, but system complexity is reduced
Solution Approach 1:
The patent implements dynamic voltage regulation by switching between buck and boost converter modes based on real-time voltage comparisons. The controller continuously monitors input and output voltages and adjusts the converter operation accordingly, enabling adaptive impedance matching that maximizes power transfer efficiency while managing system complexity through intelligent control
Solution Approach 2:
The system changes operating parameters by switching between different conversion modes (buck/boost) based on voltage conditions. When input voltage exceeds output voltage, it operates in buck mode; when output voltage exceeds input voltage, it operates in boost mode. This parameter switching enables efficient power transfer across varying voltage conditions without requiring separate dedicated circuits for each scenario
2Adaptability or versatility
If bidirectional power transmission is implemented, then system versatility is improved, but device complexity increases
Solution Approach 1:
The patent employs a universal integrated DC-DC converter that can perform both buck (step-down) and boost (step-up) conversions within a single device. This multi-functional converter enables the system to operate in both power receiving mode (from wireless charger to device) and power transmitting mode (from device to wireless charger), achieving bidirectional power transmission without requiring separate dedicated converters for each direction
Solution Approach 2:
The system enables reverse power flow by inverting the normal charging direction. When the device has sufficient battery charge, the integrated converter reverses the power flow direction to transmit power wirelessly to the charger, allowing the device to function as a power source. This inversion capability provides bidirectional operation without adding significant hardware complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances power transfer efficiency by accurately regulating voltage and impedance, allowing for bidirectional wireless power transmission, reducing energy loss, and improving the reliability of wireless charging systems.
Implementation Method 1
a resonator configured to receive a power wirelessly through a mutual resonance with a power transmitter
Implementation Method 2
convert the DC voltage stepped up by the integrated DC/DC converter into an AC voltage based on a resonant frequency, and to amplify the converted AC voltage
Data Source
AI summary
An apparatus and a method for charge control are provided. The apparatus for charge control may include an integrated direct current-to-direct current (DC/DC) converter configured to step up an output voltage level of a load to be greater than or equal to a supply voltage level set in a power amplifier, and the power amplifier configured to convert a direct current (DC) voltage stepped up by the integrated DC/DC converter into an alternating current (AC) voltage based on a resonant frequency, and to amplify the converted AC voltage. The apparatus for charge control may include a rectification unit configured to convert an AC power received wirelessly into a DC power; and a DC/DC converter configured to step down a voltage level of the DC power to a voltage level required by a load in the receiving mode.